From WordNet (r) 3.0 (2006) [wn]:
ahead
adv 1: at or in the front; "I see the lights of a town ahead";
"the road ahead is foggy"; "staring straight ahead"; "we
couldn't see over the heads of the people in front";
"with the cross of Jesus marching on before" [syn:
ahead, in front, before]
2: toward the future; forward in time; "I like to look ahead in
imagination to what the future may bring"; "I look forward to
seeing you" [syn: ahead, forward] [ant: back,
backward]
3: in a forward direction; "go ahead"; "the train moved ahead
slowly"; "the boat lurched ahead"; "moved onward into the
forest"; "they went slowly forward in the mud" [syn: ahead,
onward, onwards, forward, forwards, forrader]
4: ahead of time; in anticipation; "when you pay ahead (or in
advance) you receive a discount"; "We like to plan ahead";
"should have made reservations beforehand" [syn: ahead, {in
advance}, beforehand]
5: to a more advanced or advantageous position; "a young man
sure to get ahead"; "pushing talented students ahead"
6: to a different or a more advanced time (meaning advanced
either toward the present or toward the future); "moved the
appointment ahead from Tuesday to Monday"; "pushed the
deadline ahead from Tuesday to Wednesday"
7: leading or ahead in a competition; "the horse was three
lengths ahead going into the home stretch"; "ahead by two
pawns"; "our candidate is in the lead in the polls"; "way out
front in the race"; "the advertising campaign put them out
front in sales" [syn: ahead, out front, in the lead]
adj 1: having the leading position or higher score in a contest;
"he is ahead by a pawn"; "the leading team in the pennant
race" [syn: {ahead(p)}, in the lead, leading]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Ahead \A*head"\, adv. [Pref. a- + head.]
1. In or to the front; in advance; onward.
[1913 Webster]
The island bore but a little ahead of us.
--Fielding.
[1913 Webster]
2. Headlong; without restraint. [Obs.] --L'Estrange.
[1913 Webster]
To go ahead.
(a) To go in advance.
(b) To go on onward.
(c) To push on in an enterprise. [Colloq]
To get ahead of.
(a) To get in advance of.
(b) To surpass; to get the better of. [Colloq.]
[1913 Webster]